Pneumatic valve.



E. E. Haq.

` PNEUMATIC VALVE.

APPLCATIUN FILED JUNE 5,191?.

Yatented July 9, 1918.

' I Inl/(enfer: 7 n, Edu/NZZEHOZZL EDWARD E. HOLT, OE CHICAGG, ILLINOIS,ASSIGNOR TO HOLT AU'WI DEVICES COMPANY,

0F CHICAGO, ILLINOS, CORPORATION OF ILLINOIS.

, PNEUMATIC VALVE.

Specification of Letters Patent.

Patented July e, 191s.

Application filed .Tune 5, 1.917. Serial No. 173,028.

To all whom t may concern Be it known that I, EDWARD E. Hour, a citizenof the United States, residing at Chicago, .county of Cook, and State ofllinoi's, have invented certain new and usefull 11nprovements inPneumatic Valves, of which the-following is a specification.-

The present invention has to do with certain .improvements in airvalves, and has particular reference to the construction of tire Valvesfor use on pneumatic tires; but certain features of the invention willbe found to be of value for use in air valves for other classes ofservice. As a matter of convenience, and because the features of theinvention are very well adapted for use on tire valves, I have shown thefeatures as being applied to ,a tire valve, and will so claim thefea-tures in certain of the claims.

In. order for a valve for this service to find favor,' itmust be ofYvery simple construction, so that it can he, manufactured from a minimumnumber of parts of simple form, and which can be readily assembled. itmust also be constructed so that it-will provide a very efficient sealagainst the leakage of air under high pressure, and it must also be ofsuch form that this efficient seal will be maintained at all times.Furthermore the valve should be so constructed that there will be noloss of air during the process `of inflation, and during the process ofmakingand opening the connections from the pump to the valve.

The use of springs and the like in connection with movable portions ofpneumatic valves is very undesirable, not only from the standpoint ofmanufacture, but also from the standpoint of certainty of operation atall times after the parts have been assembled. Furthermore, the use ofgaskets or washers or the like at the sealing surfaces, is also veryundesirable. On the contrary, a metallic seal, if properly formed andassembled, will very thoroughly and y efficiently insure against anyloss of air by klealmge or seepage. Experience has shown that where ametal to metal valve seating is used there is great difficulty inproviding a sutliciently perfect seat toinsure perfectly against anyloss of air. In fact even where a conical valve is used, in combinationwith acbnical valve seat, it is necessary to very accurately grind boththe valve and the seat in order to insure a perfectly airtight clo sure.

One of the objects ofthe invention is to provide a tire valve whichshall embody the desirable features hereinbefore referred to, not onlyfrom a standpoint of manufacture7 but also from a standpoint ofsubsequent operation. Another object is to provide a conical valve otfsuch construction that, when 'forced into its seat, itwill yieldslightly or sufficiently to insure a perfect closure so as to insure aperfectly air-tight `ioint,

Other objects and useswill appear from a detailed description of theinvention which consists Ain the features of construction andcombinations of parts hereinafter described and claimed.

Referring to the drawings:

Figure 1 shows a longitudinal section through the assembled valve, theplunger and actuating sleeve being in raised position for inflation;

Fig. 2 shows a View corresponding to Fig. 1, the plunger andactuatingsleeve being lowered into the sealing position;

Fig. 3 shows in elevation the plunger and actuating sleeve as removedfrom the body portion of the valve;

Fig'. et shows a plan view correspgnding to Figs. l and 2; and

Fig. 5` shows a fragmentary detail of the lower end' of the plunger andthe valve seat,-

/ethe valve block being shown in cross-section.

In the several figures I have shown the features of my invention asbeing applied to a valve having a threaded stem 6 with a grooved flange7. This grooved flange seats against the inner surface of the tube, anda lock nut or the like may be threaded down alo-ng the stem 6 so as toengage the outer surface of the tube in the usual manner. Furthermore,the stem 6 may be extended up through the felly of the wheel in thecustomary manner. If desired, a valve Cap of suitable form may besecured onto theV threaded stem, although this is a matter ofconvenience in any particular case and does not form any feature of thepresent invention.

At a suitable point Within the bore of the stem G I provide an upwardlyfacing conical valve seat 8. The upper portion 10 of the stein v6 isshown as being of reduced size and provided on its upper end withthreads 11. Vithin the upper portion ot the stem is slidably mounted atubular niember 12, the lower with ai v-downwardly facing" co'nic'alvalve. seat 13. The valve member 11 operates .vvitliin the stemt.between the seats Se and v 13. The upper portion-15` ot' 'th-is. valvemember is of conical formation and adapted to engage the valve seat 13while lower end 16 of the valve member 1l is also of'conical formation.and adapted to enage.V

'3 the valve seat 8. T liisvalve member, there- Afore, `is shown ascoiiiprising a pair ot oppositely faced truncated cones.' ,Y

The valve member 1drA is connected tothe lower end of the valve stem 17.The upper Aend of the valve stem carries an enlargement 18 ot' anysuitable form, `vvliichlenlargement is adapted toy engage the upper end.ofthe vtubular member 1Qat certain times'.l The valve stem` '17 is olvsmaller size than the bore of the`tulmlar member 12, and the enlargement18 is otV suitable` form tol Vpei-mit air to pass byv and' downkalongside ot the valve stem.

The upperend of the tubular member 12 i is'conneeted'to an actuatingsleeve 19, which actuating sleeve engages the threads 11 of 'theextension l() ot the stem (S. Consequently,

by turningtlie actuatingsleeve7 the tubular member 12' will be raised orlowered 'with respect to the stein G. Aconvenient torination visthatillustrated inthe drawings. in which the upper end'of the tubular member12 is threadedinto the actuating sleeve 19. A convenient .form ofattachment oi' the valve member 14 to the valve stem 17 is" l/ thatshown in detail .in 141g. 5. s shown in said ligure, the valve member isthreaded onto the lower end ot" the valve stein. ln order to insure apermanent threaded 4conneet/ion, the valve member may be provided with'al socket 20' communieatingwith the.

threads. on the inner end ofthevalve stein, f

so tliat'upon pouring a drop oif lead or 'i solder or the `like intoAsaid pocket',y the' parts will. be permanently locked together.

EXamination' ol?y Figs. 1 and 2 in particular will reveal the'presenceot an` inturned flange or bead 21 on the lower end ofthe actuatingsleeve v19. This llange will serve l to limit the upward movement oftlie actu-- y atingsleeve, so vthat after the parts-have been assembled,said sleeve cannot ybe removed from 'the upper end ot' the stein 6.- Theupperporti'on of the valvestem 6 has the downwardlyfacing shoulder 21"against.r .which the `flange or bead 21'seats, and the flange 21fissoformed with respect to the shoulder 21 that, when the upwardInoveynient-ot the flange is limited, asshown in Fig, 1, an'air-tight'conneetion is effected Aat this point. Consequently, theflange 21 serves'not only to limit the upward movementof the sleeve 19,but also serves to inend zot which Lis provided Y l I ni the 'following`manner: The tubular niemthel of inilating` the tire.

vtermed a ver f )erfect rimar air sure an air-tight. connection when thesleeve is `t'ully raised.

The parts may be'conveniently assembled ber 12 is threaded .into theactuatingsleeve 1S). Thereupon thev valve stein 17 is set into position.through the tubular member, the valve member 1l istlireaded onto thelower end ot the stein, and permanently secured in the manner justdescribed.. Uponthe completimi of vthese operations, these parts willassume the condition shown in Fig. 8.

T=lt 'is to' be observed that the distance between the valve member 11and the enlargenient 1b is sutlicient to permit a desired amount ot' upand down movement of the valve member andthe valve stem with respect tothe valve seat 13. r[his amount of movement will be desired during` theproc-ess .Having assembled l. and then thejactuat-ing sleeve 19 isthreaded down along-said actuating stem. Finally, the lower end of theactuating sleeve is 'beaded in, as shown at Q1, so that thereatter theactuating sleeve cannot be removed. i x v 'Upon threading the actuatingsleeve downwardly the maximumg distance, as shown in Fig.y 2, the. lowerend 16. of the \al ve member 14 will be forced ir'mlyinto ther conicalvalve seat 8. At 'the saine time, the upper end 15 of the valve memberwill be forced firmly into engagement with. the conical valve seat 13.A'Thus there will be seal by the lower end 16 'of ythe valve, and also averyaperleet secondary air seal by the :iipper rend '15 of the valve,

.Upon threading the actuating sleeve 19 upwardly the distance betweentlievalve seats 13 and S will be increased, that one or the other orboth of the endsrof the valve member 14 vwill be disengaged from thecorresponding valve seat. -ll the tire be under pr are at the time theactuating sleeve is thus unthreaded to raise the tubular member, thevalve `member 14 will be held in engagement with the valveiseat 13, sothat any leakage of air will be prevented during this raisingjlroperation. Thereupon an air-tube or the like maybe connected to thethreaded upper end 22 of the actuating sleeve for the purpose ofintlating the tlre. i y

i' During the inflating operation, the valve member will, be forceddownwardly away from the seat 13, Il the amount of this downwardmovement be suilicient, then the lower end 16 of the valve member. dllseat against the valve seat 84 and thus prevent any further intlation.However, by limit'ng the downward movement ol 'the valve s em,

` the parts to -the point thus Yfar described, 'the tubularV member 12Ais set down into the upper end et' the stem assurance will be had thatsuch reseating willvnot occur. The upward movement of. the actuatingsleeve 19 will be limited by the bead'21, and -the downward movement ofthe valvestem' will not be resisted until the enlargement 18 engagesthevupper end of the tubular -nember '12. `By properly proportioning theparts, assurance will be had that upon threading the actuating sleeve 19upwardly the maximum distance, the en* largement 18 will be engaged bythe upper -end of the tubular member '12 before any metal to metal valveseating is used, it will generally be diilicult to secure a perfectlylair-tight `seating unless the valve and seat be very accurately ground.However, by the use of the features which I will now explain, aperfectly air-tight seal can be obtained even when the parts are notaccurately ground. For this purpose, I so form the seating portion ofthe valve member that the same will have a certain amount ,ofresiliency, thus making it possible for the valve to accommodate itselfto any irregularities between the contours of the valve' and seat whenthe parts are forced together. In the arrangement illustrated, I providea socket or recess 23 in the lower portion of the valve Imember 14, sothat the lower et ge 24 of said valve memberjs vrelatively thin, and,consequently, has aI certain amount of resiliency or ability to adjustitself under pressure to inequalities of contour. I then form the valveseat 8 on a different angle from the valve portion 16, generally alarger angle, so that, when the valve member is wedged home, its loweredge24 will first come into and will remain in engagement with theva'lve seat 8, thus considerably limiting the area of contact to theextrel'ne lower portion of the valve member, which lower portionpossesses the resiliency previously explained, because of the presenceof the socket or recess Q3. Consequently, when the valve member 14 isforced home a-n extremely air-tight and perfect connecttion is insured.I wish to point out the fact that this latter feature having to do withthe air-tight seating of the valve against its valve seat may be usedwith :equal advantage, or at any rate with great advan- -tage in manyother locations than in tire valves. Consequently, I do not limit theuse A of this ,feature to tire valves, except as I may do so in theclaims. l

This application, as to certain features herein disclosed, is acontinuation of my copend'ing application, SerialzNo. 133,734,

which was filed 'November'. 27|, 1916, and allowed March 22, 1917.

While I have herein shown and described' only a single embodiment of thefeatures of my invention, still it will be understood that I am notlimited to this embodiment except as I may limit myself in the claims.

I claimt:

1. In a pneumaticvalve, the combination of a conical valve plug and aconical valve seat therefor, both of circular cross section, the taperof tlre cone of the valve being less than the taper of the cone of thevalve seat whereby when the conical plug is forced into the conicalvalve seat contact first takes place on the lower edge of theconicalplug, there being a recess or socketof uniform diameter in thelower end of the valve plug to thereby provide a thin circular wall inthe lower portion of the valve plug, said wall increasing in thicknessfrom its contacting edge upwardly toward the body of the plug for thepurpose-specified, and means for forcing the plug into the valve seat,substantially as described.

2. In a pneumatic valve, the combination .of a conical valve seat and aconical valve ing edge toward the body of the plug to thereby insure amaximum flexibility in the cxtreme contacting portion of the wall forthe purpose specified. 1 EDIV RD E. IIOLT;

